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  2. Holocene calendar - Wikipedia

    en.wikipedia.org/wiki/Holocene_calendar

    The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant (AD/BC or CE/BCE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans shifted from a hunter-gatherer lifestyle to agriculture and fixed settlements.

  3. Stardate - Wikipedia

    en.wikipedia.org/wiki/Stardate

    A stardate is a fictional system of time measurement developed for the television and film series Star Trek. In the series, use of this date system is commonly heard at the beginning of a voice-over log entry, such as "Captain's log, stardate 41153.7. Our destination is planet Deneb IV …". While the original method was inspired by the ...

  4. Calculation of radiocarbon dates - Wikipedia

    en.wikipedia.org/wiki/Calculation_of_radiocarbon...

    The calculation of radiocarbon dates determines the age of an object containing organic material by using the properties of radiocarbon (also known as carbon-14 ), a radioactive isotope of carbon. Radiocarbon dating methods produce data based on the ratios of different carbon isotopes in a sample that must then be further manipulated in order ...

  5. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    A light-year, alternatively spelled light year ( ly or lyr[ 3] ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km ( Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi.

  6. How Many Work Hours Are In A Year? Convert Your Hourly ... - AOL

    www.aol.com/many-hours-convert-hourly-wage...

    The average American works close to 40 hours per week, and there are 52 weeks in a year. Doing the math tells us that there are 260 work days (52 weeks x 5 days) and 2,080 work hours (52 weeks x ...

  7. Annualized failure rate - Wikipedia

    en.wikipedia.org/wiki/Annualized_failure_rate

    Annualized failure rate. Annualized failure rate ( AFR) gives the estimated probability that a device or component will fail during a full year of use. It is a relation between the mean time between failure ( MTBF) and the hours that a number of devices are run per year. AFR is estimated from a sample of like components—AFR and MTBF as given ...

  8. Hindu units of time - Wikipedia

    en.wikipedia.org/wiki/Hindu_units_of_time

    The lifespan of the Devas (gods) lasts for 100 of their years. [19] 24 hours (1 day & night) of Devas = 1 solar year (Sun's two 180-day motions: northern and southern) 30 days (1 month) of Devas = 30 solar years (1 year of Pitris) 12 months (1 year) of Devas = 360 solar years; 100 years (lifespan) of Devas = 36,000 solar years

  9. Residence time - Wikipedia

    en.wikipedia.org/wiki/Residence_time

    The concept of residence time originated in models of chemical reactors. The first such model was an axial dispersion model by Irving Langmuir in 1908. This received little attention for 45 years; other models were developed such as the plug flow reactor model and the continuous stirred-tank reactor, and the concept of a washout function (representing the response to a sudden change in the ...

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